ComputerVoltageSources

I got my quicks today.  I built one as a digital only version and the 
other as a full configuration.  I validated my test code for both the 
analog and digital configurations.  I have more testing to do to see 
how much power increases on the module if I leave the oscillators 
running all the time.  I think it is not much and will shorten the 
execution time by about 2.4 mS.

I also have 16 potentiometers that I need to wire up and make sure 
everything is really working correctly.  So far I have just been using 
clip leads either to ground or +5 volts.

I've updated my page with some photos and code.
http://modularsynthesis.com/modules/synthmodules/PSIM-Expansion/PSIM-
Expansion.htm

On a side note, somewhere between changing boards, running two power 
supplies, and a load of clip leads, my CVS stopped working.  I 
determined that it would hang whenever executing an I2C command.  I 
thought I had fried my I2C chip but instead I seemed to have fried P6 
or P7 on my AtomPro28.  I must have done something nasty to those 
pins and I didn't put over/under voltage protection on them (I should 
have since those pins exit my module).  I had a spare AtomPro24 so I 
am running that.  I guess I'll have to add some diodes when I put in a 
replacement AtomPro28.

I'll update my page when I get some current measurements.  For now I 
think I will be a bit more slow and cautious.

Dave

--- In ComputerVoltageSources@yahoogroups.com, "djbrow54" <davebr@...> 
wrote:
>
> I may want one of these 16 analog input boards for my PSIM for a 
> sequencer so I designed an ExpressPCB mini-board. For those of you 
> that don't know, this is a fixed-size set of 3 quicks with no solder 
> mask or silk screen for $51.  It makes small runs of PCBs pretty 
> affordable.